Add TorchGeo CLI tutorial

[adamjstewart]

Basically copied the docs from the README to a tutorial.

[calebrob6]

torchgeo validate and torchgeo test won't use the trained model by default

[adamjstewart]

Yeah, I'm not sure if there's an easy way to know the name of the trained model checkpoint to use. Maybe we can specify the name to use? I wish --best worked.

[calebrob6]

You can setup a ModelCheckpoint to save last then point it to /tmp/eurosat100/lightning_logs/version_0/checkpoints/last.ckpt

[adamjstewart]

Hmm, I'll look into it, but I'm hoping to not make the config.yaml too complicated.

[calebrob6]

Then we need to be really clear that "torchgeo test" and "torchgeo validate" are just going to return results from a random initialized model (which is.... not helpful). I think a reader would expect "torchgeo test" to test the trained model as the tutorial is written currently. We should also show users how to actually test their model too because that's going to be what people want to do with "test" or "validate" lol

[adamjstewart]

Fixed